Appendix 1. Multivariate logistic regression demonstrating factors associated with willingness to pay for Astra Zeneca

Variables		Willing to pay for Astra Zeneca vaccine	aOR* (95%CI)	p-value
Age (year)
	From 18 to 29	798 (66.8)	Ref
	From 30 to 39	388 (72)	0.97 (0.67 - 1.39)	0.856
	From 40 to 49	209 (74.9)	1.15 (0.73 - 1.82)	0.536
	50 and above	61 (76.2)	1.24 (0.66 - 2.34)	0.498
Sex
	Male	448 (73.7)	Ref
	Female	1008 (67.9)	0.8 (0.64 - 1.002)	0.052
Occupation
	Health staff	320 (81.2)	Ref
	Worker	66 (65.3)	0.45 (0.27 - 0.75)	0.002
	Other governmental staff	325 (70.2)	0.49 (0.35 - 0.69)	0.000
	Student	541 (66.5)	0.61 (0.42 - 0.89)	0.012
	Own business	50 (68.5)	0.65 (0.36 - 1.17)	0.149
	Others	154 (62.1)	0.45 (0.31 - 0.67)	0.000
Education
	High school or lower	275 (64.0)	Ref
	Above	1181 (71.0)	1.14 (0.89 - 1.47)	0.295
Marital status
	Single	730 (66.0)	Ref
	Married	682 (73.8)	1.16 (0.79 - 1.68)	0.447
	Divorced/ Widowed	44 (69.8)	1.11 (0.58 - 2.11)	0.757
Family size
	One	45 (61.6)	Ref
	Two	55 (60.4)	0.95 (0.49 - 1.83)	0.879
	From three people	1356 (70.3)	1.43 (0.86 - 2.38)	0.173
Family economic status
	Poor/near poor	55 (54.5)	Ref
	Others (average, high income)	1401 (70.3)	1.59 (1.05 - 2.44)	0.030
Allergy
	Yes	386 (65.1)	Ref
	No	907 (72.5)	1.3 (1.05 - 1.62)	0.016
	Do not know/remember	163 (65.5)	1.08 (0.78 - 1.48)	0.655
Occupational changes due to COVID-19
	Yes	326 (59.5)	Ref
	No	1130 (73.1)	1.64 (1.28 - 2.09)	0.000
Income reduction due to COVID-19
	Yes	507 (65.2)	Ref
	No	949 (72.2)	1.07 (0.85 - 1.35)	0.554

aOR: Adjusted Odd Ratio